SAS revision 4 errata

Sheffield, Robert L robert.l.sheffield at intel.com
Wed Jun 25 11:45:28 PDT 2003


* From the T10 Reflector (t10 at t10.org), posted by:
* "Sheffield, Robert L" <robert.l.sheffield at intel.com>
*
Can we also take this opportunity to fix the hang states, SP16, SP17, and SP18 that occur if the attached SATA device reverts to COMINIT? The suggested change is to add arcs from SP16, SP17, and SP18 to SP4:OOB_COMSAS triggered by COMINIT Detected.

Regards,
Bob


-----Original Message-----
From: Jim.Coomes at seagate.com [mailto:Jim.Coomes at seagate.com]
Sent: Monday, June 23, 2003 2:40 PM
To: Elliott, Robert 
Cc: t10 at t10.org
Subject: RE: SAS revision 4 errata


* From the T10 Reflector (t10 at t10.org), posted by:
* Jim.Coomes at seagate.com
*
Rob,

You are right. I missed the SP1 State.

The corrected fix to the problem I raised is just an editorial change.

The fix is as Mark's suggestion:

Change: transition 6.7.3.3.3

To: Transition SP2:OOB_NoCOMSASTimeout to SP4:OOB_COMSAS

Jim

----- Forwarded by Jim Coomes/Seagate on 06/23/03 04:27 PM -----
                                                                                                                                       
                      "Elliott, Robert                                                                                                 
                      (Server Storage)"        To:       <Jim.Coomes at seagate.com>, <t10 at t10.org>                                       
                      <Elliott at hp.com>         cc:                                                                                     
                      Sent by:                 Subject:  RE: SAS revision 4 errata                                                     
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* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert (Server Storage)" <Elliott at hp.com>
*
> -----Original Message-----
> From: Jim.Coomes at seagate.com [mailto:Jim.Coomes at seagate.com]
> Sent: Friday, June 20, 2003 2:02 PM
> To: Elliott, Robert (Server Storage); t10 at t10.org
> Subject: SAS revision 4 errata
>
> Rob,
>
> If there is a rev to SAS, here is another error:
>
> Conflict text to figure:
> doc page 122, Section 6.7.3.3.3 Transition SP2:OOB_NoCOMSATimeout to
> SP3:OOB_AwaitCOMINIT_Sent
> states "This transition shall occur after receiving a COMINIT Detected
> message."
>
> doc page 121 Figure 67 shows the SP2:OOB_NoCOMSASTimeout
> state tranitioning
> to SP4 (rather than SP3) when COMINIT Detected message is received.
>
> Problem:
>
> Note: This is not the case illustrated in figure 66. In that case the
> timeout occurred on COMINIT. Here the timeout is on COMSAS.
>
> A transition to  SP3:OOB_AwaitCOMINIT_Sent will result in a hang as
> Transmit COMINIT only occurs in SP0: COMINIT and a COMINIT Transmitted
> confirmation is need to exit SP3:OOB_AwaitCOMINIT_Sent.
>
> A transition to SP4:OOB_COMSAS is a problem for the attached
> phy. It may
> have completed a Hot-plug timeout and transitioned to
> SP0: COMINIT. A COMINIT Detected confirmation is required to
> exit the SP0.

There's one other exit arc in the bottom left you might have missed.
COMINIT Transmitted causes a transition from SP0 into SP1.  SP1
looks for both COMSAS Detected and COMINIT Detected.

> Suggested Fix:
> Change 6.7.3.3.3 to:
> "Transition SP2:OOB_NoCOMSATimeout to SP0:OOB_COMINIT"
>
> Change figure to reflect this change:
> Delete arrow SP2 to SP4,
> Add arrow SP2 to SP0 with COMINIT Detected.

I agree with Mark's suggestion - only the typo from SP3 to SP4
needs to change.

>
> Jim
>

--
Rob Elliott, elliott at hp.com
Hewlett-Packard Industry Standard Server Storage Advanced Technology
https://ecardfile.com/id/RobElliott



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